Azo dyestuff.



warren s rrrrns @FFKQE KARL scHmMAoHER, or HUCHST-ON-THE-MAIN, GERMANY, ASSIGNOR 'ro FARBWERKE VORM. MEISTER LUCIUS & BRU'NING, or HooHsr-on-THE-MAIN, GERMANY, A

CORPORATION OF GERMANY.

No Drawing.

To all whom it may concern:

Be it known that I, KARL SGH'IRMACHER, Ph.D., chemist, a citizen of the Empire of Germany, residing at Hochst-on-the-Main, Germany, have invented certain new and useful Improvements in New Azo Dyestuffs, of which the following is a specification.

I have found that valuable azo dyestuffs are obtained by causing diazo compounds of aminosulfones of the aromatic series to act upon a 2-arylamino-8-oXynaphthalene-6- sulfonic acid. The dyestuffs thus obtained are dark-brown powders, difficultly soluble in water with a brown color, readily soluble in alkalis with a brown color, and dye Wool brown tints remarkable for their great fastness to Washing.

-The constitution of the new dyestufi's corresponds to the formula:

obtainable by condensing p-toluenesulfochlorid with benzene and subsequently nitrating and reducing the condensation prodnot, are diazotized with 40 parts of hydrochloric acid of 20 B. and 7 parts of nitrite; the diazo solution thus obtained is filtered and introduced into a solution of 32 parts of 2 phenylamino -.8 oxynaphthalene 6 sulfonic acid and 40 parts of sodium carbonate. The coupling occurs rapidly with separation of the dyestufi after heating for some time to 8090 C. and adding some salt the dyestuff may be separated by filtration. When AZO DYESTUFF.

. Patented Nov. 26, 1912.,

dry, it forms a brownish-black powder hav lng'the constitution:

being dark-brown powders, difiicultly soliible in water with a brown color, readily soluble in alkalis with a brown color, splitting up when treated with tin and hydrochloric acid into an aminodiarylsulfone and 2-arylamino 7 amino-8-oxynaphthalene 6 sulfonic acid. l

2. As a new product, the azo dyestufi of the constitution:

OH anr-so oaaaona-rw-n-f Warriors,

so ui v a being a brownish-black powder, difficulty soluble in water, readily soluble in'lalkalis', splitting up on addition of tin and hydrochloric acid into m-amino-phenyl-p-tolylsultone and 2-phenylam-ino-7-amino-8-oxynaphthalene-o-sulfonic acid.

In testimony whereof, I afilx my igna ture in presence of two witnesses.

KARL SCHIRMACHER. Witnesses:

J EAN GRUND, CARL GRUND, 

